A cluster of virtual machines across physical ESXi hosts (also known as a cluster across boxes or CAB) protects against software failures and hardware failures on the physical ESXi hosts by placing the cluster nodes on separate ESXi hosts. This configuration requires shared storage for the clustered disk resources.
The following figure shows a cluster-across-boxes setup.
- Two virtual machines on two different ESXi hosts run WSFC.
- The virtual machines share a private network connection for the private heartbeat and a public network connection.
- Each virtual machine is connected to shared storage.
You can expand the cluster-across-boxes model and place multiple virtual machines on multiple ESXi hosts. For example, you can consolidate three clusters of two physical machines each to two ESXi hosts with four virtual machines each.